KR20120020358A - High temperature properties testing method of iron ore, and high temperature weight synchysis testing device used in the method - Google Patents

High temperature properties testing method of iron ore, and high temperature weight synchysis testing device used in the method Download PDF

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Publication number
KR20120020358A
KR20120020358A KR1020100083930A KR20100083930A KR20120020358A KR 20120020358 A KR20120020358 A KR 20120020358A KR 1020100083930 A KR1020100083930 A KR 1020100083930A KR 20100083930 A KR20100083930 A KR 20100083930A KR 20120020358 A KR20120020358 A KR 20120020358A
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South Korea
Prior art keywords
dropping
iron ore
melt
load
temperature
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KR1020100083930A
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Korean (ko)
Inventor
김유나
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현대제철 주식회사
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Priority to KR1020100083930A priority Critical patent/KR20120020358A/en
Publication of KR20120020358A publication Critical patent/KR20120020358A/en

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/24—Test rods or other checking devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
    • F27D21/0028—Devices for monitoring the level of the melt
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G01N25/02—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering
    • G01N25/04—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering of melting point; of freezing point; of softening point
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D19/00—Arrangements of controlling devices
    • F27D2019/0096—Arrangements of controlling devices involving simulation means, e.g. of the treating or charging step

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)

Abstract

PURPOSE: A high-temperature property test method for iron ore and a high-temperature under-load softening test device used for the method are provided to compare and analyze the properties of molten materials of iron ore according to temperature section by collecting the molten materials according to loading temperature section. CONSTITUTION: A high-temperature property test method for iron ore comprises a step of charging iron ore into a reducing furnace(11) of a high-temperature under-load softening test device(10) and reducing iron ore by raising temperature and applying a load and a step of collecting molten materials, which are dropped according to the reduction of iron ore, into a loading cell(23) on a rotary disk(21) according to loading temperature section and measuring the amount of generated materials. The loading temperature of molten materials is confirmed with an illuminance sensor(27).

Description

High temperature properties testing method of iron ore, and high temperature weight synchysis testing device used in the method

The present invention relates to a method for evaluating high temperature characteristics of iron ore and a high temperature load softening test apparatus used therein. More specifically, the high temperature characteristics of iron ore tested by simulating similar experimental conditions for blast furnace for estimating softening fusion zone formed in the blast furnace An evaluation method and a high temperature load softening test apparatus used therefor.

The blast furnace is an upright type reaction furnace constructed as a fireproof wall, and charges raw materials such as iron ore, coke and limestone and auxiliary raw materials from the top, and raises or reduces iron ore with CO gas generated by the combustion of coke by hot air. Is a kind of continuous reactor that produces molten pig iron.

An object of the present invention is to simulate the experimental conditions similar to the blast furnace to quantify the amount of change of the melt by the dropping temperature section in the blast furnace and to facilitate the separation of the melt high temperature characteristics of iron ore and high temperature load softening experiments used therein To provide a device.

According to a feature of the present invention for achieving the object as described above, the present invention is to charge the iron ore in the reduction furnace of the high temperature load softening test apparatus and to reduce the iron ore through the elevated temperature and load, and to reduce the iron ore And collecting the melt, which is dropped into the lower portion, in the dropping cell on the rotating disk for each dropping temperature section and measuring the amount of the dropping product.

The dropping temperature of the melt is confirmed by an illuminance sensor which is disposed on a path in which the melt directly on the rotary disk is dropped and transmits the dropping time of the melt to the controller.

The rotating disk has at least three dropping cells, and the melt is collected in different dropping cells by the rotating disk which is automatically rotated at every temperature rise by the set temperature at the initial dropping time measured by the illuminance sensor.

The amount of change of the load by the dropping temperature section is quantified by the dropping time of the melt and the generated amount of the drop measured by the illuminance sensor.

An electric furnace including a reduction furnace into which iron ore is charged, a reaction tube in which the reduction furnace is disposed, and a heating element disposed inside the reaction tube and heating the iron ore charged in the reduction furnace, and an upper portion of the reduction furnace And a load adding member for applying a load to the iron ore during the reduction experiment of the iron ore, and an illuminance sensor disposed on a path in which the melt generated by the reduction experiment of the iron ore is dropped and detecting a dropping time of the melt. Include.

And a rotary disk disposed below the reaction tube and having three or more dropping cells, one of the dropping cells being positioned corresponding to the lower portion of the reaction tube by the rotation of the rotating disk.

The lower portion of the rotary disk is provided with a load cell for measuring the weight of the melt dropped in the dropping cell.

The present invention can quantify the amount of change of the melt for each dropping temperature section in the blast furnace by using the high temperature load softening test device and can facilitate the separation of the melt.

In addition, the present invention can be estimated for the time of the first dropping temperature generation of the melt, it is possible to collect a drop of the iron ore melt for each dropping temperature interval. Therefore, it is possible not only to compare the characteristics of the melt by the dropping temperature section, but also to quantify the amount of change in the drop.

1 is a schematic diagram of a furnace situation.
Figure 2 is a cross-sectional view showing a schematic configuration of a high temperature load softening test apparatus according to the present invention.
Figure 3 is a perspective view showing a drop cell provided in the rotary disk of the high temperature load softening test apparatus according to the present invention.
4 is a view showing an example of a display unit of the high temperature load softening test apparatus according to the present invention.
5 is a block diagram showing a high temperature characteristic evaluation method of iron ore using the high temperature load softening test apparatus according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail.

The high temperature characteristic evaluation method of the iron ore of the present invention is a method of measuring the amount of load generated by each dropping temperature section using a high temperature load softening test apparatus.

As shown in FIG. 1, the situation in the blast furnace is divided into a block, a melting zone, a dropping zone, a combustion zone, and a roadbed from the top.

The inner shape of the fusion zone has a great influence on the high temperature reducing gas and breathability, and as a result, it affects the temperature distribution in the furnace, the reduction of iron ore, the aging and productivity. Therefore, the shape of the fusion furnace is very important in blast furnace operation.

In the fusion zone, indirect and direct reduction of iron ore proceeds, and reduced iron and unreduced iron react with the slag component to form a semi-melt state, and coke forms a layer between them. When the temperature is about 1520 ~ 1620 ℃, iron ore and slag become liquid and start to drop. If molten iron and molten slag are mixed in the melt separation operation, it is impossible to accurately measure the time and amount of actual melt occurrence.

Therefore, by using the high temperature characteristic evaluation method of iron ore using the high temperature load softening test apparatus of the present invention is to measure the amount of load generated by each dropping temperature section. Here, "dropping" means that the molten iron ore in the liquid phase falls to the bottom. For convenience of explanation, a mixture of melt and drip will be used.

As shown in FIG. 1, the iron ore M is charged into the reduction furnace 11 of the high temperature load softening test apparatus 10, and the iron ore M is reduced by heating and applying a load. The melt (m) dropped to the lower side according to the reduction of M) is collected in the dropping cell 23 of the rotary disk 21 for each dropping temperature section to measure the amount of the dropping product. Here, the temperature increase and the load application are to provide the same environmental conditions as the blast furnace operating environment.

The dropping temperature is checked using a dropping detector disposed on a path in which the melt m is dropped. The drop detection unit is an illuminance sensor 27 that detects the light generated during the drop of the melt m to detect a drop point of the melt.

The dropping time of the melt detected by the illuminance sensor 27 is transmitted to the control unit 29 to be described below, and the control unit 29 uses temperature information of the reducing furnace provided from the reducing furnace temperature sensing unit 28 of the electric furnace. To determine the dropping temperature of the melt. Reduction furnace temperature sensing unit 28 may be a thermocouple installed in the electric furnace.

The melt is collected in the different drop cells 23 by the rotary disk 21 which automatically rotates every 50 ° C. on the basis of the time when the illuminance sensor 27 provides the initial dropping point information to the controller 29. The rotary disk 21 is provided with at least three dropping cells 23 so that the melt is collected for each dropping temperature section of the melt m.

For example, when the initial dropping time of the melt (m) measured by the illuminance sensor 27 is 1520 ° C, the melt is collected in the dropping cell 23a once, but is heated to 50 ° C at the initial dropping point of the melt (m). When the dropping temperature reaches 1570 ° C., the rotary disk 21 is automatically rotated to collect the melt in the dropping cell 23b twice.

In addition, when the temperature is increased from 1570 ° C. to 50 ° C. to 1620 ° C., the rotary disk 21 is automatically rotated so that the dropping melt is collected in the dropping cell three times. Here, the rotation of the rotary disk 21 allows the melt to be collected for each dropping temperature section.

Then, melts generated at a temperature range of 1520 ° C. or more and 1570 ° C. or less are collected in the first dropping cell 23a, and melts generated at a temperature range of 1570 ° C. or more and 1620 ° C. or less are collected in the dropping cell 23b. The melt | dissolution generate | occur | produced in the 3rd dropping cell 23c in the range of 1620 degreeC or more and 1670 degrees C or less is collected.

At this time, the temperature range of the melt collected in each dropping cell 23 above or below is to consider a case in which a small amount of the same temperature of the melt is collected.

For example, during the collection of the melt in the first dropping cell 23a, the temperature is elevated to 50 ° C. at the initial dropping temperature so that the next melt is collected in the dropping cell 23a last, even though the next melt is collected in the dropping cell 23b twice. This is because a small amount of melt having the same temperature as that of temperature can be collected in the dropping cell 23b twice.

The amount of the melt dropped in each drop cell 23, that is, the load, is measured by the load generation amount measurement unit. The load generation amount measuring unit is a load cell 25 mounted on the lower portion of the rotary disk 21 to measure the weight of the load loaded on each drop cell 23. The load generation amount of each drip cell 23 is measured by the load cell 25, and the load generation amount measured by the load cell 25 is the generation amount of the load per dropping temperature section.

The dropping time of the melt (m) measured by the illuminance sensor 27 and the amount of load generated by the load cell 25 are displayed on the display unit 31 by the control unit 29, and the change amount of the load per dropping temperature section is displayed. Used to quantify. That is, it is used to quantify in which temperature conditions a lot of loading occurs.

In addition to the above-described role, the controller 29 automatically rotates the rotary disk 21 every 50 ° C. on the basis of the initial dropping time measured by the illuminance sensor 27. That is, the control unit 29 controls the rotary disk 21 to rotate by a set angle by operating the disk operating unit at every 50 ° C. temperature increase based on the initial dropping time measured by the illuminance sensor 27.

Meanwhile, the high temperature load softening test apparatus 10 for performing the high temperature characteristic evaluation method of the iron ore described above will be described. The high temperature load softening test apparatus 10 is a device that simulates the blast furnace-like experimental conditions for the estimation of softening fusion zone.

As shown in FIG. 2, the high temperature load softening test apparatus 10 includes a reduction furnace 11 into which iron ore M is charged, a reaction tube 13 in which the reduction furnace 11 is installed, and a reaction tube. An electric furnace (17) for heating and maintaining the heating element (15) provided around the (13) and the iron ore (M) charged in the reduction furnace (11) of the reaction tube (13) by the heating element (15). And a load adding member 19 for applying a load to the iron ore M during the reduction experiment of the iron ore M charged to the reduction furnace 11.

The reduction furnace 11 is fixed to the upper side of the reaction tube 13 as a crucible-type furnace. The upper part of the reduction furnace 11 is provided with a load adding member 19 for applying a load to the iron ore M, and a through hole 12 is formed in the lower portion so that only the melt of the iron ore M is dropped.

The reaction tube 13 corresponds to a passage through which the melt of the iron ore M is dropped downward. A heating element 15 for raising the temperature of the iron ore M charged into the reduction furnace 11 is installed around the reaction tube, and at least one dropping cell 23 is provided below the reaction tube 13. . The heating element 15 may employ a hot wire, and the reaction tube 13 employs a carbon tube resistant to high temperatures.

The dropping cell 23 is a container in which a dropping material, which is a melt (m) of iron ore, is collected. As shown in FIG. 3, the dropping cell 23 is fixed to the upper portion of the rotating disk 21, and one of the dropping cells 23 is positioned to correspond to the lower portion of the reaction tube 13 according to the rotation of the rotating disk 21. .

Rotation of the rotating disk 21 is made by the disk actuating portion 22. The disk operating unit 22 may be a rotating motor for rotating the rotary disk 21 by a set angle so that each dropping cell 23 is located in the lower portion of the reaction tube 13 in order. In addition, the disk operating unit may employ various forms as long as it can rotate the rotary disk 21 by a set angle.

The load cell 25 which is a load generation amount measuring part is mounted in the lower part of the rotating disk 21. As shown in FIG. The load cell 25 measures the generation amount by the weight of the dripping material, which is a melt collected in the dripping cell 23, and transmits the generated amount to the control unit 29.

It further comprises an illuminance sensor 27 as a drop detection unit for detecting the dropping time of the melt (m). The illuminance sensor 27 is installed between the lower part of the reaction tube 13 and the upper part of the rotary disk 21 corresponding to the path in which the melt m is dropped. The illuminance sensor 27 detects the illuminance of the light generated when the melt is dropped to measure the dropping time of the melt (m).

It further includes a reducing furnace temperature sensing unit 28 for sensing the temperature of the reducing furnace 11 in the electric furnace. The reduction furnace temperature detection unit 28 transmits the reduction furnace temperature in the electric furnace to the controller 29 in real time.

The controller 29 determines the initial dropping temperature of the melt from the dropping time information received and the reduction furnace temperature information in the electric furnace.

As shown in FIG. 4, the display unit 31 may externally display the melt dropping time point, the maximum dropping generation temperature, and the amount of dropping cell loadings measured by the illuminance sensor 27. Referring to FIG. 5, the controller 29 receiving information from the illuminance sensor 27 and the load cell 25 causes the above information to be displayed on the display unit.

Hereinafter, the operation of the high temperature characteristic evaluation method of iron ore according to the present invention.

In order to evaluate the high temperature characteristics of the iron ore (M), the iron ore (M) is charged into the reduction furnace 11 of the high temperature load softening test apparatus 10, and the load is added to the iron ore (M) using the load-adding member (19). Give a load. Applying a load to the iron ore (M) is an artificial simulation of the natural load generated by the lamination of iron ore, coke in the blast furnace.

When the temperature rises to about 1500 ° C by the elevated temperature, the iron ore M begins to melt by a physicochemical reaction, and the melt of the iron ore is dropped through the through hole 12. The melt m dropped through the through-hole 12 is collected in the dropping cell 23 on the rotary disk 21 provided below the reaction tube 13.

In this process, the illuminance sensor 27 detects the dropping time of the melt (m), and the load cell 25 measures the amount of dripping collected in the dropping cell (23). The dripping time of the melt m sensed by the illuminance sensor 27 and the amount of dripping measured at the load cell 25 are transmitted to the control unit 29 in real time, and the control unit 29 displays this on the display unit 31. .

The control unit 29 rotates the rotary disk 21 whenever the dropping temperature of the melt is increased by 50 ° C based on the melt dropping temperature initially recorded on the display unit 31 so that the dropping cell 23 moves by one cell. To control (22).

In accordance with the rotation of the rotary disk 21, each drip cell 23 collects drips, which are dripping melts m, for each dropping temperature section. The collected load is used as a comparative data analysis of the melt (m) for each dropping temperature section.

Within the scope of the basic technical idea of the present invention, many other modifications are possible to those skilled in the art, and the scope of the present invention should be interpreted based on the appended claims. will be.

10: High temperature softening test device 11: Reduction furnace
12: Through 13: Reaction tube
15: heating element 17: electric
19: Load member 21: Rotating disc
22: disc operating unit 23: loading cell
25: load cell 27: light sensor
28: reduction path temperature detection unit 29: control unit
31: Display part

Claims (7)

Charging the iron ore into a reduction furnace of the high temperature load softening test apparatus and reducing the iron ore by raising the temperature and applying a load;
And collecting the melt dropped to the lower portion according to the reduction of the iron ore in the dropping cell on the rotating disk for each dropping temperature section, and measuring the generation amount of the dropping iron ore. The method according to claim 1,
Dropping temperature of the melt,
The high temperature characteristic evaluation method of iron ore, characterized in that it is confirmed by the roughness sensor disposed on the path of the melt directly on the rotating disk to transmit the dropping time of the melt to the controller. The method according to claim 2,
The rotating disk has at least three dropping cells,
The melt is collected in different drop cells by a rotary disk that is automatically rotated every time the temperature rises by the set temperature at the time of the first drop measured by the illuminance sensor. The method according to any one of claims 2 to 3,
The high temperature characteristic evaluation method of iron ore, characterized in that for quantifying the amount of change of the load by the dropping temperature interval by the dropping time and the amount of the load of the melt measured by the illuminance sensor. A reduction furnace into which iron ore is charged;
A reaction tube in which the reduction furnace is disposed;
An electric furnace having the reaction tube disposed therein and including a heating element for heating up the iron ore charged into the reduction furnace;
A load addition member installed on an upper portion of the reduction furnace for applying a load to the iron ore during the reduction experiment of the iron ore;
The high temperature load softening test apparatus, characterized in that it comprises a roughness sensor arranged on the path of the melt generated by the reduction experiment of the iron ore dropping the drop time of the melt. The method according to claim 5,
It is further provided with a rotary disk disposed below the reaction tube and having three or more dropping cells,
High temperature load softening test apparatus, characterized in that one of the dropping cell is located to correspond to the lower portion of the reaction tube by the rotation of the rotary disk. The method of claim 6,
High temperature load softening test apparatus, characterized in that the lower portion of the rotary disk is provided with a load cell for measuring the weight of the melt dropped in the dropping cell.
KR1020100083930A 2010-08-30 2010-08-30 High temperature properties testing method of iron ore, and high temperature weight synchysis testing device used in the method KR20120020358A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101304692B1 (en) * 2012-04-10 2013-09-06 주식회사 포스코 Tester of refractoriness under load
CN113025769A (en) * 2021-03-09 2021-06-25 东北大学 Method for measuring molten drop performance of iron ore by simulating reduction conditions of blast furnace
KR20210119116A (en) * 2020-03-24 2021-10-05 현대제철 주식회사 Tester of refractoriness under load

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101304692B1 (en) * 2012-04-10 2013-09-06 주식회사 포스코 Tester of refractoriness under load
KR20210119116A (en) * 2020-03-24 2021-10-05 현대제철 주식회사 Tester of refractoriness under load
CN113025769A (en) * 2021-03-09 2021-06-25 东北大学 Method for measuring molten drop performance of iron ore by simulating reduction conditions of blast furnace

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